Burglar-alarm.



R. FRESH.

BURGLAR ALARM APPLICATION FILED JUNE 15, 1911.

1&443313. Patented Oct. 23, 1917 INVENTOR WITNS v BA ATTORNEY niir era ROY FRESH, OF TOWNSEND, KANSAS.

BURGLAR-ALARM.

Specification of Letters Patent.

Patented Oct. 23, 1917.

To all-whom it may concern.

Be it known that 1, Roy FRESH, a citizen of the United States, residing at Townsend, in the county of owley and State of Kansas, have invented new and useful Improvements inBurglar-Alarms, of which the following is a specification.

This invention relates to improvements in burglar alarms and has particular reference to a device of this character which when actuated by an intruder will explode a blank cartridge or other similar device.

In carrying out the invention, I have in mind to provide a simple, durable and efii cient alarm which may be applied with equal facility to a window or door.

Another object is to furnish an alarm which may readily be adapted for utilizing either center-fire or rim-fire blank cartridges.

My further intention is to reduce the cost of manufacture of the device.

To effect these ends and others which will hereinafter appear, I have embodied the invention in the novel arrangement and disposition of the parts described in the specification below and in the claims and depicted in the drawings, in which Figure 1 is a fragmentary elevation of a door and door casing with the alarm comprised in the present invention applied thereto.

Fig. 2 is a fragmentary view illustrating the application of the alarm to a window.

Fig. 3 represents a longitudinal section through the plunger barrel and cartridge holder.

Fig. a is an end view of the alarm.

Fig. 5 shows the details of the invention.

Having more specific reference to the drawings, the numeral, 1 designates the alarm in entirety. In the preferred form shown the alarm has an elongated base 2 having suitable openings for passage of attaching means shown as screws, and provided on one of the longitudinal edges 2 toward the end with a projecting portion 3 formed with a bore 4 adapted to retain the cartridge 5. The base 2 is further provided on the longitudinal edge 2 with an alined elongated projecting portion 6 spaced apart from the cartridge holder 3 to permit insertion and removal of cartridges. The projecting portion 6 is formed with a bore 7 to constitute a guide for plunger 8 slidably inserted in the bore 7 for movement toward and away from the cartridge holder 3. The plunger 8 is embraced by a coiled tension spring 9 having one end secured to the guide 6 toward the cartridge holder 3 and the other end secured to the plunger 8 to" ward the opposite extremity. the plunger 8 toward the cartridge holder 3 is suitably formed to constitute a firing pin adapted to be forcibly driven against the end of the cartridge by the spring 9 to explode the cartridge; and to normally restrain such movement, the other end of the plunger is formed with an offset portion 10 adapted to engage against the end of the guide 6, adjacent the end of a slot 11 formed longitudinally of the guide 6 toward the last-mentioned end. By the above construction it will be seen that when the plunger 8 is partially rotated as by contact of a door in the act of opening the door the offset portion 10 will enter the slot 11 permitting the spring 9 to forcibly project the firing pin in contact with and explode the cartridge. For rendering the alarm inoperative when desired the body is formed adjacent the slot 11 on the opposite side to that normally occupied by the offset portion 10 with a projection 12 behind which the offset 10 may be engaged to prevent accidental discharge. For use in connection with a window the base is preferably attached to the window frame as clearly shown in the drawings and a cam 13 having a base 14: and an upstanding angular flange 15 thereon is properly secured to the window in the present instance by screws 16 extending through suitable openings in the base 14: into the window frame, whereby in opening the window the cam will engage againstthe offset 10 actuating it to enter the slot 11. For convenience in manufacturing, the base 2, cartridge holder 3 and guide 6 are preferably stamped from a single piece of sheet metal and suitably formed as in a die. It should be noted that the cartridge holder 3 in coaxial disposition relatively to the guide 6 is adapted for use with center-fire cartridges and for use with rim-fire cartridges may readily be bent out of alinement.

The herein described preferred form of my invention is not to be interpreted as in any way limiting the spirit or scope of the invention, it being apparent that many and The end of rariedi'orins may be constructed Without exceeding the latitude of the invention as defined in the appended claims.

What I claim is:-

l. A device of the class described. eo1n-:-

olate, a tube connected W1 av prising a base one edge thereot and adapted toireceive a cartr dge, said tube belng movable on the base plate to adapt the deviceforrini fireand center-fire cartridges, a second tube connected With said edge and located above the first tube and spaced therefrom; and a spring plunger in said second tube.

2. in a device of the class described, a

flat metal base, a pair of tubes spaced apart on one edge 01% the base and constituting integrally formed portions of the base one of the tubes constituting a cartridgeholder and the other tube constituting a plunger barrel, said cartridge holder adapted to be bentinto and out of ahnement with the plunger barrel to adaptthe device tor rnn- I fire andI'center-fire cartridges as desired.

3. In "a device of theclass described, a fiat:

1 laterally proj ecting oflset portion on said plunger adapted to-bear againstthe end 01' Ill-QilfllabtlSQ, a \pair oitubes; spaced apart on one edge or the base and constituting 4 integrally formed portions of the base one of thetubes constituting a cartridge holder and adapted to be bent into and out of alineinent with the other tube, said other tube constituting a plunger barreland formed rounding the plunger, said spring having one end attached to the plunger barrel and the other end attached to the plunger, a A

said plunger barreladjacentsaid slot, said plunger barrel having a prQ ecting portion ad acent one side of I said slot whereby :rotatre increment ofithe plunger may be pre- -vented when desired.

In testimony whereof Ii'atliX my signature.

1 :ROYI'FRESE-L Copies of this patent may be obtained for five cents each, by' ailressingthe \-:Commissioner of Emerita,

' 'washingtomfi. G. 

